Model · Multimodal language model
GPT-5.1 Codex Max
The November 2025 frontier agentic-coding release for long-running tasks, served Responses-only as the rotating gpt-5.1-codex-max alias with no fixed dated snapshot and retired on July 23, 2026, without downloadable model weights.
- Developer
- OpenAI
- Distribution
- Developer API
- Artifact licensing
- Proprietary access
- License scope
- Reviewed release artifacts and mandatory terms; not an assessment of training code or training data openness.
- Licenses
- OpenAI Services Agreement
- Boundary
- This record represents the GPT-5.1-Codex-Max line launched November 19, 2025, which replaced GPT-5.1-Codex as the default model in Codex surfaces and was served only as the rotating gpt-5.1-codex-max alias with no fixed dated revision; OpenAI shut the API down on July 23, 2026, naming gpt-5.6-sol the substitute. The Codex and Mini siblings, Codex application behaviors, later Codex generations, fine-tuned derivatives, and the OpenAI API platform itself are separate service, application, or model boundaries.
Risk statements
“High risk” · Precautionary
We are treating GPT-5.1-Codex-Max as High risk in the Biological and Chemical domain.
- Risk areas
- Biological or chemical
- Covers
- The model itself
Read the developer's statement ↗ · 2026-10-09 · Research confidence: High
OpenAI names this release against “High risk” in biological or chemical capability, as a precaution. The statement covers the model itself. This is the developer's own statement, not an Atlas risk rating.
Open in the directory → Open official model page ↗
Editorial ratings appear in the directory beside the profile they belong to and are never compared across collections.